Registering means for duplicators and the like



Nov. 14, 1944.

C. H. OLSEN.

' Filed Dec. 30, 1941 REGISTERING MEANS FOR DUPLICATORS AND THE LIKE Patented Nov. 14, 1944 REGISTERING MEANS FOR DUPLICATOKS AND THE LIKE Carl H. Olsen, Chicago, Ill., assignor to Henry Hildebrandt, Chicago, Ill.

Application December 30, 1941, Serial No. 424,876

4 Claims.

My invention relates to improvements in registering means for duplicators and the like, and more particularly in an improvement of a feeding mechanism thereof, the primary object of the invention being to provide registering means in such devices which is of simple construction and highly efficient in use.

Other objects will appear hereinafter.

The invention consists of the combinations and arrangements of 'parts as hereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawing forming a part thereof and in which- Figure 1 is a partial longitudinal section of a duplicator to which my improvement has been applied;

Fig. 2, a section taken substantially on line Fig. 3, a top plan view illustrating the registering means and showing same in the position assumed after it has been advancing 180 degrees from the position indicated in Fig. 1; and

Fig. 4. an enlarged detail transverse section of said registering means in which the thickness of the parts has been exaggerated for the sake of clearness.

The embodiment of the invention illustrated in the drawing comprises a frame H) in which a stencil cylinder l I is rotatably mounted, said cylinder carrying the usual inked stencil II in the usual manner. The usual impression roller I2 is mounted in the usual swinging frame I! and is yieldingly held against adjustable eccentrics I3 by means of a spring l4, and whereby the proper separation and operative contact between the impression roller and the stencil cylinder II is secured in the usual way. A suitable feed table I5 is provided in the frame Ill and the usual feed mechanism, not shown, is provided for feeding sheets of paper 16 into the space between the impression roller and the duplicator cylinder H during their separation. The cylinder II is provided with the usual feed plate ll for cooperation with the impression roller l2 to initiate feeding engagement between said roller and cylinder for drawing the sheet IE through the duplicator in the usual way. The parts already described, or their equivalents, are old and well known in'this art. and form no part of my present invention except in so far as they cooperate with the parts to be presently described.

However, a duplicator such as already described sometimes fails to register or position the sheets of paper being fed therethrough properly and uniformly relative to the stencil on the cylinder II. I have found by experience and experiment that this failure to register properly is due largely to slippage between the sheets of paper and the plate I! of the duplicator at the time of first engagement of said plate with said sheets, and this is especially true when the duplicator is operated by power and at relatively high speed.

To correct this defect I provide knurled surfaces l8 on the outer surface of the plate l! at plate with each sheet occurs. As shown, these knurled surfaces I8 are arranged in pairs spaced apart laterally on the said plate I1 and the knurling in each pair is oppositely disposed as shown. By this-arrangement a positive clamping and feeding engagement is provided between the plate [1 and each sheet of paper as it is presented from the table l5 so that there can be no slippage of the sheet on said plate. The positive feeding engagement with the sheet is due to the fact that the ridges of the knurling impress corresponding depressions in the sheet, thereby positively locking the sheet to the cylinder until the stencil engages it. As soon as the sheet is engaged by the stencil, which engagement occurs immediately thereafter, there can be no slippage, so that in this way proper and uniform registrations of the sheets with the stencil are obtained.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I therefore do not wish to be limited to the precise details disclosed, but desire to avail myself of such variations and modifications as fall within the scope of the appended claims.

and cooperating therewith to simultaneously.

impress and feed sheets fed thereto; means for periodically separating said cylinder and roller; means for feeding sheets into the space between said cylinder and roller while separated; and additional feeding means arranged laterally on said cylinder in and confined to the lateral space immediately preceding the stencil for initiatin the feeding of said sheets, said additional feeding means being adapted and arranged to effect positive engagement with the forward edge only of said sheets and immediately release them.

2. The construction specified in claim 1 in whichthe feeding means on the cylinder consists of a roughened surface.

3. The construction specified in claim 1 in which the feeding means on the cylinder consists of one or more knurled surfaces.

4. The construction specified in claim 1 in which the feeding means on the cylinder consists of a plurality of spaced pairs of oppositely knurled surfaces.

CARL H. OLSEN. 

